Trisazo dye containing a diphenylenesulfone structure

ABSTRACT

A polyazo dye represented by the formula ##SPC1## 
     Wherein A is an optionally substituted aromatic ring; B is an aromatic ring having at least one substituent selected from the group consisting of amino, substituted amino and hydroxy; Y is hydrogen, alkali metal, --NH 4  or amine salt residue; n is 1 or 2; and one of R 1  and R 2  is hydroxy and the other is amino.

This invention relates to novel polyazo dyes and processes for producing the same, more particularly to dyes capable of dyeing fibrous materials made of cotton, silk, wool and like fibers having hydroxyl and/or amide groups and processes for preparing the same.

Generally, polyazo dyes basically prepared from benzidine or its derivatives are well-known as dyes for fibrous materials made of fibers having hydroxyl and/or amide groups. These dyes are excellent in color, dyeability, solubility in water and chemical stability. Moreover, they assure excellent dischargeability on silk or the like. Because of thehse advantages, the polyazo dyes have long been used in a wide variety of applications. However, recent researches have revealed that benzidine and the derivatives thereof affect the living body medically. In fact these compounds are found to be very likely to cause cancer especially in the bladder when introduced into the living body. For this reason, it has been strongly desired to provide dyes which are free of any hazard of causing cancer and serviceable as substitutes for polyazo dyes of the benzidine type and which are equivalent or superior to the conventional polyazo dyes with respect to dyeability and above-mentioned characteristics.

A main object of this invention is to provide novel and useful dyes which fulfil the above requirements and processes for preparing the same.

Other objects and advantages of this invention will be apparent from the following description.

The present invention provides novel polyazo dyes represented by the formula of ##SPC2##

Wherein A is an aromatic ring having or not having a substituent, B is an aromatic ring having at least one substituent selected from the group consisting of an amino group, substituted amino group and hydroxyl group, X is ##SPC3##

Y is a hydrogen atom, alkali metal, --NH₄ group or amine salt residue, n is 1 or 2, and each of R¹ and R² is a hydroxyl group or amino group, R¹ being an amino group when R² is a hydroxyl group, or a hydroxyl group when R² is an amino group.

The present invention has been accomplished based on the novel finding that the new compounds of the formula (I) give very excellent colors and that they are almost as excellent as the conventional polyazo dyes of benzidine-type in dyeability, solubility in water and chemical stability but have no carcinogenic property and are very low in toxic properties.

Preferable examples of novel polyazo dyes represented by the foregoing formula (I) are those wherein A is a phenyl group, naphthyl group or phenyl or naphthyl group having at least one substituent of a halogen atom, lower alkyl group, lower alkoxy group, amino group, carboxyl group, nitro group and sulfonic acid group; those wherein B is ##SPC4##

M being NH₂, OH or SO₃ H; and M' and M" being the same or different and being H, NO₂, lower alkyl, SO₃ H, SO₃ Na or N(R⁶)₂, the members R⁶ being the same or different and being H, lower alkyl or phenyl substituted with lower alkyl; those wherein R¹ is a hydroxyl group, R² is an amino group and Y is a hydrogen or sodium atom. The most preferable examples of novel polyazo dyes represented by the foregoing formula (I) are those wherein A is ##SPC5## wherein B is ##SPC6##

Listed in Table 1 below are typical examples of novel polyazo dyes of this invention represented by the formula (I). These compounds are indicated by giving examples of A, R¹, R², Y, n, X and B in the formula of ##SPC7##

                                      Table 1                                      __________________________________________________________________________     No.                                                                               A-         R.sup.1                                                                           R.sup.2                                                                           Y                                                          X-                                                                             B                                                    Color                     __________________________________________________________________________      1            OH NH.sub.2                                                                          Na                               bluish                                                                         black                                                                          greenish                   2            "  "  " "                "             black                      3            "  "  " "                "             bluish                                                                         black                      4            "  "  " "                "             "                          5            "  "  " "                              "                          6 "          "  "  " "                              green                      7 "          "  "  " "                              black                      8            OH NH.sub.2                                                                          Na                               bluish                                                                         black                      9 "          "  "  " "                              bluish                                                                         black                     10            "  "  " "                              black                     11            "  "  " "                              bluish                                                                         black                     12            "  "  "                                black                     13            OH NH.sub.2                                                                          Na                               black                     14 "          "  "  " "                              bluish                                                                         black                     15            "  "  " "                              bluish                                                                         green                     16            NH.sub.2                                                                          OH " "                              greenish                                                                       black                     17            "  "  " "                              black                     18            OH NH.sub.2                                                                          Na                               reddish                                                                        black                     19            "  "  " "                "             "                         20            "  "  " "                              bluish                                                                         black                     21 "          "  "  " "                              green                     22            "  "  " "                              bluish                                                                         black                     23            "  "  " "                              greenish                                                                       black                     24            OH NH.sub.2                                                                          Na                               greenish                                                                       black                     25            "  "  " "                              reddish                                                                        black                     26            "  "  " "                              "                         27            "  "  " "                              reddish                                                                        black                     28            "  "  " "                              bluish                                                                         black                     29            OH NH.sub.2                                                                          Na                               bluish                                                                         black                     30 "          NH.sub.2                                                                          OH " "                              black                     31 "          OH NH.sub.2                                                                          Na                               bluish                                                                         black                     32            "  "  " "                              black                     33            "  "  " "                              bluish                                                                         black                     34            OH NH.sub.2                                                                          Na                               bluish                                                                         black                     35            "  "  " "                              bluish                                                                         black                     36            "  "  " "                              bluish                                                                         black                     37            "  "  " "                              black                     38            "  "  " "                              green                     39            OH NH.sub.2                                                                          Na                               black                     40            NH.sub.2                                                                          OH " "                              black                     41            "  "  " "                              "                         __________________________________________________________________________

The novel polyazo dyes of this invention represented by the formula (I) do not contain benzidine or its derivatives as the basic component and therefore have no carcinogenic property and are extremely low in their toxicity.

The fact that the starting aromatic diamines having the formula of H₂ N--X--NH₂ (X is the same as defined before) exhibit no carcinogenic property can be seen from the following test.

CARCINOGENIC PROPERTY

4, 4'-diaminodiphenylsulfone was orally administered to female rats of 40 days of age once every 3 days. After 9 months' continuous administration, the animals were killed. The internal organs thereof were weighed and made into specimens of tissues to determine carcinogenic property. The results showed that no carcinoma was observed at a dose of 25 times as much as the amount of benzidine at which the latter gave 50% carcinoma.

The novel polyazo dyes are as excellent as the conventional dyes basically prepared from benzidine or its derivatives with respect to dyeability and chemical stability and are almost equivalent to the known dyes in giving excellent colors. The present novel dyes are readily soluble in water and effectively dye fibrous materials of hydroxyl- and/or amide-containing fibers. The dyeings obtained not only exhibit excellent colors equivalent to those given by the conventional polyazo dyes of benzidine type but also have good fastness to light, washing, acid and alkali.

The novel polyazo dyes of this invention can be produced by various processes as exemplified below.

PROCESS 1

A process comprising the steps of coupling, in a desired sequence, a tetrazotized product of aromatic diamine represented by the formula

    H.sub.2 N--X--NH.sub.2                                     (II)

wherein X is the same as defined before with an aminonaphtholsulfonic acid represented by the formula ##SPC8##

wherein R¹, R², n and Y are the same as defined before and with an aromatic compound represented by the formula

    B -- H                                                     (IV)

wherein B is the same as defined before, and coupling the resulting disazo dye with a diazotized product of aromatic amine represented by the formula

    A -- NH.sub.2                                              (V)

wherein A is the same as defined before.

PROCESS 2

A process comprising the steps of coupling a tetrazotized product of aromatic diamine of the formula (II) with an aminonaphtholsulfonic acid of the formula (III), coupling the resulting product with a diazotized product of aromatic amine of the formula (V), and coupling the product obtained with an aromatic compound of the formula (IV).

PROCESS 3

A process comprising the steps of coupling an aminonaphtholsulfonic acid of the formula (III) with a diazotized product of aromatic amine of the formula (V) to prepare a compound of the formula ##SPC9##

wherein A, R¹, R², Y and n are the same as defined before, coupling the compound with a tetrazotized product of aromatic diamine of the formula (II), and coupling the resulting product with an aromatic compound of the formula (IV).

The novel dye of this invention can be prepared by any of the processes described above. However, if R¹ of the compound represented by the formula (III) is OH (i.e. ##SPC10##

the processes 1 and 2 are preferable, whereas if R¹ is NH₂ (i.e. ##SPC11##

the process 3 is desirable.

Examples of the aromatic diamine of the formula

    H.sub.2 N--X--NH.sub.2                                     (II)

wherein X is the same as defined before to be used as a material in this invention are 3,3'-diamino-diphenyl sulfone, 4,4'-diamino-diphenyl sulfone, 3,3'-diamino-diphenylene sulfone, etc.

Examples of the compound represented by the formula (III) ##SPC12##

(wherein R¹, R² and Y are the same as defined before) to be used in this invention are 1-amino-8-naphthol-3,6-disulfonic acid, sodium 1-amino-8-naphthol-3,6-disulfonate, 1-amino-8-naphthol-3-sulfonic acid, 1-amino-8-naphthol-6-sulfonic acid, 1-naphthol-8-amino-3,6-disulfonic acid, sodium 1-naphthol-8-amino-3,6-disulfonate, etc.

The compound represented by the formula

    B --H                                                      (IV)

wherein B is the same as defined before, usable as a material in this invention, includes aromatic amines, phenols or naphthols having or not having a substituent. Examples thereof are toluylenediamine, N,N-diethyl-N'-acetyl-m-phenylenediamine, aminonaphthalene, aminonaphthalene sulfonic acid, aminonaphthalene disulfonic acid, aminonaphthol sulfonic acid, aminonaphthol disulfonic acid, acetylaminonaphthol sulfonic acid, acetylaminonaphthol disulfonic acid, benzoylaminonaphthol sulfonic acid, benzoylaminonaphthol disulfonic acid, 1-chloro-8-naphthol-3,6-disulfonic acid, 3-aminophenol, N,N-di(o-toluyl)-m-aminophenol, 3-acetylaminophenol, 3-hydroxy-4-methyldiphenylamine, aniline, 3-aminotoluene, 1,3-phenylenediamine, 3-β-hydroxyethylaminoaniline, 2-methyl-1,3-phenylenediamine, 4-methyl-1,3-phenylenediamine, 3-acetylaminoaniline, 3-aminophenyl urea, 3-aminophenylglycine, 6-methyl-3-amino-phenylglycine, 1,3-phenylenediamine-4-sulfonic acid, 4-chloro-1,3-phenylenediamine, 4-nitro-1,3-phenylenediamine, 3-aminoanisole, 3-dimethylaminoaniline, 3-oxalylaminoaniline, 3-glyconylaminoaniline, 2,4-diamino-acetoanilide, naphthol, naphthol-sulfonic acid, naphthol-tri-sulfonic acid, phenol, cresol, chlorophenol, etc.

Examples of the aromatic amine of the formula (V)

    a -- nh.sub.2                                              (v)

(wherein A is the same as defined before) to be used in this invention are aniline, methylaniline, ethylaniline, t-butylaniline, cyclohexylaniline, dimethylaniline, methoxyaniline, ethoxyaniline, nitroaniline, dinitroaniline, nitrochloroaniline, 2-aminodiphenylether, 4-aminodiphenylether, 2-amino-2'-methyldiphenylether, 4-amino-4'-methyldiphenylether, 2-amino-2'-chlorodiphenylether, 4-amino-4'-chlorodiphenylether, acetylaminoaniline, propionylaminoaniline, oxalylaminoaniline, aminophenylurea, benzoylaminoaniline, 3-chloro-benzoyl-aminoaniline, 4'-chlorobenzoylaminoaniline, 3'-methylbenzoylaminoaniline, 4'-methyl-benzoylaminoaniline, 3'-nitrobenzoylaminoaniline, 4'-nitrobenzoylaminoaniline, 4-benzoylethylaminoaniline, 2-methyl-4-acetylaminoaniline, 2-methyl-5-acetyl-aminoaniline, 2-methyl-4-benzoylaminoaniline, 2-methyl-5-benzoylaminoaniline, 2-methyl-4-formylaminoaniline, 4-methyl-3-formylaminoaniline, 2-methyl-5-oxalyl-aminoaniline, 4-methyl-3-oxalylaminoaniline, chloroaniline, methylchloroaniline, methylmethoxyaniline, methoxychloroaniline, dimethoxyaniline, methoxyacetylaniline, methoxyacetylaminoaniline, methoxyoxalylaminoaniline, 4-methylaniline-2-sulfonic acid, 4-methoxyaniline-2-sulfonic acid, 4-ethoxyaniline-2-sulfonic acid, 4-methylaniline-3-sulfonic acid, 4-methoxyaniline-3-sulfonic acid, aniline-2-sulfonic acid, 5-acetylaminoaniline-2-sulfonic acid, 4-chloroaniline-3-sulfonic acid, 4-acetylaminoaniline-2-sulfonic acid, 4-benzoylaminoaniline-2-sulfonic acid, 4-oxalylaminoaniline-3-sulfonic acid, aniline-3-sulfonic acid, aniline-4-sulfonic acid, aminobenzoic acid, anicidine, naphthionic acid, etc. Among these especially preferable are aniline, 4-nitroaniline, aniline-4-sulfonic acid and naphthionic acid.

According to this invention the tetrazotization and diazotization in any of the foregoing processes can be effectively carried out exactly in conventional manners. For example, the starting aromatic diamine having the formula of H₂ N--X--NH₂ (X is the same as defined before) is reacted with a nitrite in the presence of a mineral acid such as sulfuric acid, hydrochloric acid, etc., at a low temperature, preferably at 0° to 10°C, to produce a tetrazotized product of the aromatic diamine. The diazotization of the aromatic amine having the formula of A--NH₂ (A is the same as defined before) can also be conducted under the same conditions as above.

Likewise, coupling can be effected in conventional manners. For example, the coupling is carried out at a temperature of lower than 25°C, preferably 0° to 5°C for 10 minutes to 24 hours. The pH of the reaction system may vary over a wide range and may be suitably selected in accordance with the kind of the reactants to be coupled. The sequence of reaction and pH of the reaction system in the above processes are illustrated as follows, in which

Aa shows aromatic amine of the formula (V),

1-ans shows 1-amino-8-naphtolsulfonic acid of the formula ##SPC13##

(Y and n are the same as defined before),

8-ANS shows 8-amino-1-naphtholsulfonic acid of the formula ##SPC14##

(Y and n are the same as defined before),

Ada shows aromatic diamine of the formula (II), and

Ac shows an aromatic compound of the formula (IV) ##EQU1##

The novel polyazo dyes of this invention are used for dyeing fibrous materials made of fibers having hydroxyl and/or amide groups. Exemplary of the fibers containing hydroxyl groups are cotton, hemp, cellulose, viscose rayon, cuprammonium artificial silk, vinylon (polyvinyl alcohol fiber), etc. Further examples of fibers having amide groups are silk, wool, polyamide synthetic fiber (nylon), polyurethane synthetic fiber, etc. The fibrous materials of these fibers include various products using these fibers such as thread, woven fabrics, knitted fabrics, felts, nonwoven fabrics, paper, leathers, etc.

The fibrous materials made of fibers containing hydroxyl groups and/or amide groups can be dyed or printed with the novel polyazo dyes of this invention in the same manner as conventionally practiced with this type of polyazo dyes. For instance, to dye a fibrous material of cotton, it is suitable to employ a dyeing bath having a pH of 8 to 10 and containing 1 to 8% by weight of a dye and 5 to 40% by weight of an inorganic salt, based on the fibrous material to be dyed. The fibrous material is placed in the bath with a liquor ratio of 1 : 20 to 1 : 40. The bath is then gradually heated and maintained at a temperature approximate to the boiling point for 20 to 50 minutes for dyeing. When dyed, the fibrous material is taken out, roughly washed with water, squeezed and dried. Further fibrous materials of fibers having amide groups can be dyed within a wide pH range of from acidic to alkaline but, in general, they are preferably dyed in neutral to acidic pH range, most preferably at a pH of about 2 to 7. In the case where a fibrous material of wool is to be dyed, for example, it is preferable to use a dyeing bath having a pH of 2 to 7 and containing 3 to 10% by weight of a dye and 1 to 5% by weight of concentrated sulfuric acid or acetic acid, based on the fibrous material to be dyed. The fibrous material is placed in the bath at 60°C with a liquor ratio of 1 : 30 to 1 : 40. The bath is then heated gradually to the boiling point and maintained at this temperature for 30 to 90 minutes for dyeing. When dyed, the fibrous material is taken out, roughly washed with water, squeezed and dried. In the case where a fibrous material of silk is to be dyed, for example, it is preferable to employ a dyeing bath having a pH of 7 to 10 and containing 50 to 300% by weight of a dye and 0.5 to 20% by weight of an inorganic salt, based on the weight of the fibrous material to be dyed. The fibrous material is placed in the bath with a liquor ratio of 1 : 50 to 1 : 150 and heated at 70° to 100°C for 15 to 90 minutes. When dyed, the fibrous material is taken out and treated in the same manner as above.

To the dyeing bath can be added various additives conventional in the art, such as, accelerating agents, level dyeing agents, retarding agents, etc. Examples of accelerating agents are sodium chloride, sodium sulfate, various surfactants, etc. Level dyeing agents and retarding agents are, for example, higher alcohol detergents, Turkey red oil, Marseille soap, Monopole soap, silk scouring waste, sodium carbonate, sodium pyrophosphate, etc. Further, the fibrous material dyed with the present dye can be subjected to conventional after-treatment. For such purpose there can be used acetic acid, formaline, polyethylene, polyamines, cation surfactants, developers, metal salts, etc.

EXAMPLE 1

22 g (0.1 mol) of 3,3'-diamino-diphenyl sulfone was dissolved in 60 g of concentrated hydrochloric acid and 60 g of water with heating and the resulting solution was placed into a mixture of 100 g of water and 100 g of ice. Next, to the above solution was added at 0°C a solution of 14 g (0.2 mol) of sodium nitrite in 50 g of water to tetrazotize the solution. An aqueous solution of 36.4 g (0.1 mol) of sodium 1-amino-8-naphthol-3,6-di-sulfonate was added to the tetrazotized solution, and the mixture was stirred at 0°C for 3 to 6 hours.

An aqueous solution of sodium carbonate was then added to the resulting solution to make it alkaline. To this solution was then added a diazotized solution previously prepared by dissolving 10 g of (about 0.1 mol) of aniline (aromatic amine) in 30 g of concentrated hydrochloric acid and 100 g of water and further adding 7 g (0.1 mol) of sodium nitrite at 0°C. The mixture was stirred at 0°C for 2 hours.

Subsequently, hydrochloric acid was added to the solution obtained to make it acidic. A solution of 12 g (0.12 mol) of m-phenylenediamine (aromatic compound) in 200 g of water was then added to the solution, and the mixture was stirred overnight to complete the reaction. The product obtained was filtered with suction, washed with water and then with ethyl alcohol and dried to obtain a dye, which had a structure of Dye No. 1 and was bluish black.

EXAMPLES 2 to 15

The components listed in Table 2 below were used as aromatic amine and aromatic compound according to Example 1 to obtain various dyes in the same manner as in Example 1. The resulting dyes and their colors are listed in Table 2 below.

                                      Table 2                                      __________________________________________________________________________                                      Produced                                      Example                          dye                                           No.  Aromatic amine                                                                             Aromatic compound                                                                              (Dye No.)                                                                             Color                                  __________________________________________________________________________      2   p-nitroaniline                                                                             m-phenylenediamine                                                                             2      black                                   3   sulfanilic acid                                                                               "            3      bluish                                                                         black                                   4   naphthylaminesulfonic                                                                         "            4      "                                           acid                                                                       5   aniline     m-toluylene-diamine                                                                            5      "                                       6      "        phenol          6      green                                   7      "        N'-(o-toluyl)-m-aminophenol                                                                    7      black                                   8      "        2,4-diamino-sulfonic acid                                                                      8      bluish                                                                         black                                   9      "        naphthylamine   9      "                                      10   p-nitroaniline                                                                             naphthylaminesulfonic                                                                          10     black                                                   acid                                                          11   naphthylaminesulfonic                                                                      naphthylamine   11     bluish                                      acid                               black                                  12   aniline                     12     black                                  13   p-nitroaniline                                                                             2,4-diamino-sulfonic                                                                           13     black                                                   acid                                                          14      "        m-toluylene-diamine                                                                            14     bluish                                                                         black                                  15   sulfanilic acid                                                                            N'-(o-toluyl)-m-aminophenol                                                                    15     bluish                                                                         black                                  __________________________________________________________________________

EXAMPLE 16

13.0 g of a hydrochloric acid salt of aniline was dissolved in a mixture of 23 g of hydrochloric acid and 50 g of H₂ O, and the resulting solution was diazotized with 69 g of sodium nitrite at 0°C. A neutral aqueous solution of 31.9 g of 8-amino-1-naphthol-3,6-disulfonic acid was then added to the diazotized product. The mixture was stirred overnight to effect complete coupling. Na₂ CO₃ was dissolved in the resulting product to adjust the same to a pH of 7. Subsequently, in a mixture of 100 g of water and 56 g of 30% HCl, 22.0 g (0.1 mol) of 3,3'-diamino-diphenyl-sulfone was tetrazotized at 0°C with 13.8 g of sodium nitrite. The first coupled product was treated with 20 g of Na₂ CO₃ and was thereafter added to the tetrazotized product of 3,3'-diamino-diphenylsulfone which had previously been neutralized with an aqueous solution of sodium acetate. The mixture was stirred to complete coupling. To the resulting product was added a solution prepared from 100 g of H₂ O, 17 g of Na₂ CO₃ and 11 g of m-phenylenediamine and the mixture was stirred for 12 hours. The dye obtained was then subjected to salting out with common salt, followed by filtration and drying. The dye had the structure of Dye No. 16 and was greenish black.

EXAMPLE 17

22.0 g of 4,4'diamino-diphenylsulfone was dissolved in 60 g of concentrated hydrochloric acid and 60 g of water with heating, and the resulting solution was placed into a mixture of 100 g of water and 100 g of ice. Next, a solution of 14 g of sodium nitrite in 50 g of water was added at 0°C to the above solution to effect tetrazotization. An aqueous solution of 36.4 g of sodium 1-amino-8-naphthol-3,6-disulfonate was added to the tetrazotized solution, and the mixture was stirred at 0°C for 3 to 6 hours.

An aqueous solution of sodium carbonate was then added to the resulting solution to make it alkaline. To this solution was added a diazotized solution previously prepared by dissolving 10 g of aniline in 30 g of concentrated hydrochloric acid and 100 g of water, and adding 7 g of sodium nitrite at 0°C. The mixture was stirred at 0°C for 2 hours. Subsequently, hydrochloric acid is added to the solution to make it acidic. A solution of 12 g of m-phenylenediamine in 200 g of water was added to the solution and the mixture was stirred overnight to complete the reaction. The product was then filtered with suction, washed with water and then with ethyl alcohol and dried to obtain a dye, which had a structure of Dye No. 18 and was reddish black.

EXAMPLES 18- 28

Various dyes shown in Table 3 below were prepared in the same manner as in Example 1 except that 4,4'-diamino-diphenylsulfone was used in place of 3,3'-diamino-diphenylsulfone and the components listed in Table 3 were used as aromatic amine and aromatic compound. The colors of the dyes thus obtained are also shown in Table 3 below.

                                      Table 3                                      __________________________________________________________________________                                  Produced                                          Example                      Dye                                               No.  Aromatic amine                                                                             Aromatic compound                                                                          (Dye No.)                                                                             Color                                      __________________________________________________________________________     18   aniline     m-phenylenediamine                                                                         19     reddish                                                                        black                                      19   sulfanilic acid                                                                            m-toluylenediamine                                                                         20     bluish                                                                         black                                      20      "        phenol      21     green                                      21   naphthylaminesulfonic                                                                      naphthylamine                                                                              22     bluish                                          acid                           black                                      22   aniline     m-toluylenediamine                                                                         23     greenish                                                                       black                                      23   p-nitroaniline                                                                                "        24     "                                          24   naphthylaminesulfonic                                                                      m-phenylenediamine                                                                         25     reddish                                         acid                           black                                      25   sulfanilic acid                                                                               "        26     "                                          26      "        N'-(o-toluyl)-m-                                                                           27     "                                                           aminophenol                                                   27   sulfanilic acid                                                                            naphthylamine                                                                              28     bluish                                                                         black                                      28   aniline     naphthylaminesulfonic                                                                      29     bluish                                                      acid               black                                      __________________________________________________________________________

EXAMPLE 29

A dye was prepared in the same manner as in Example 16 except that 4,4'-diamino-diphenylsulfone was used in place of 3,3'-diamino-diphenylsulfone. The resulting dye was black and had a structure of Dye No. 30.

EXAMPLES 30 to 37

Various dyes shown in Table below were prepared in the same manner as in Example 1 except that diphenylene sulfone was used in place of 3,3'-diamino-diphenylsulfone and the components listed in Table 3 were used as aromatic amine and aromatic compound. The colors of the dyes thus obtained are also shown in Table 4 below.

                                      Table 4                                      __________________________________________________________________________                                Produced                                            Example                    Dye                                                 No.  Aromatic amine                                                                             Aromaic compound                                                                         (Dye No.)                                                                             Color                                        __________________________________________________________________________     30   aniline     m-phenylenediamine                                                                       31     bluish                                                                         black                                        31   p-nitroaniline                                                                             m-toluylenediamine                                                                       32     black                                        32   sulfanilic acid                                                                            m-phenylenediamine                                                                       33     bluish                                                                         black                                        33   aniline     m-toluylenediamine                                                                       34     "                                            34   naphthylaminesulfonic                                                                      m-phenylenediamine                                                                       35     "                                                 acid                                                                      35   sulfanilic acid                                                                            N'-(o-toluyl)-m-                                                                         36     "                                                             aminophenol                                                   36   p-nitroaniline                                                                             m-phenylenediamine                                                                       37     black                                        37   aniline     phenol    38     green                                        __________________________________________________________________________

EXAMPLE 38

25.0 g of diphenylene sulfone was dissolved in 60 g of concentrated hydrochloric acid and 60 g of water with heating, and the resulting solution was placed into a mixture of 100 g of water and 100 g of ice. Next, a solution of 14 g of sodium nitrite in 50 g of water was added at 0°C to the above solution to effect tetrazotization. An aqueous solution of 36.4 g of sodium 1-amino-8-naphthol-3,6-disulfonate was added to the tetrazotized solution, and the mixture was stirred at 0°C for 3 to 6 hours.

An aqueous solution of sodium carbonate was then added to the resulting solution to make it alkaline. To this solution was added a diazotized solution previously prepared by dissolving 10 g of aniline in 30 g of concentrated hydrochloric acid and 100 g of water, and adding 7 g of sodium nitrite at 0°C. The mixture was stirred at 0°C for 2 hours. Subsequently, hydrochloric acid is added to the solution to make it acidic. A solution of 12 g of m-phenylenediamine in 200 g of water was added to the solution and the mixture was stirred overnight to complete the reaction. The product was then filtered with suction, washed with water and then with ethyl alcohol and dried to obtain a dye, which had a structure of Dye No. 39 and was black.

EXAMPLE 39

A dye was prepared in the same manner as in Example 16 except that diphenylene sulfone was used in place of 3,3'-diamino-diphenylsulfone. The resulting dye was black and had a structure of Dye No. 40. 

What we claim is:
 1. A polyazo dye of the formula ##SPC15##wherein A is phenyl, naphthyl or phenyl or naphthyl substituted with chlorine, lower alkyl, lower alkoxy, amino, carboxy, nitro, SO₃ H or SO₃ Na; B is ##SPC16## where M is NH₂, OH or SO₃ H; M' and M" are the same or different and are H, NO₂, lower alkyl, SO₃ H, SO₃ Na or N(R⁶)₂, wherein the members R⁶ are independently H, lower alkyl or phenyl substituted with lower alkyl; Y is hydrogen, alkali metal, or NH₄ ; n is 1 or 2; and one of R¹ and R² is hydroxy and the other is amino.
 2. The dye of claim 1 wherein said A is ##SPC17##
 3. The dye of claim 1 wherein said B is one species selected from the group of ##SPC18## 